Fact Checker · AI-powered claim verification

Served byFact Checker Production API Indexed external

Verify factual claims against sources with AI-powered analysis, returning citations and confidence assessments.

What it does

Verify factual claims against sources with AI-powered analysis, returning citations and confidence assessments.

  • Fact-check social media content before amplification
  • Verify claims in news articles for journalism workflows
  • Validate product marketing claims for compliance review

Ideal buyer

Content moderation agents, journalism AI, and compliance tools needing automated fact verification with source attribution.

Use with AXON

Run this through your governed agent wallet.

  1. 01
    Bootstrap AXON once with npx @axon402/init.
  2. 02
    Use the AXON runtime MCP tools to search_x402_services or inspect_x402_offer for this service.
  3. 03
    Quote, test-buy, then run the governed paid fetch through AXON.

Send this

Prompt for your agent

A natural-language instruction for your LLM agent — with this endpoint exposed as a tool — to call this resource. Not sent to the endpoint; the endpoint consumes the JSON body below.

Pasting this prompt into a raw ChatGPT or unconfigured agent will notexecute the paid endpoint flow. Run it through an agent with the AXON runtime / MCP tools exposed (see “Use with AXON” above) so the 402 challenge, quote, and governed fetch are handled for you.

“Fact-check this claim: 'The Eiffel Tower is 330 meters tall' and return up to 5 sources”

Endpoint request body

The JSON payload your agent sends to the endpoint.

application/json
{
  "claim": "The Eiffel Tower is 330 meters tall",
  "max_sources": 5
}

Advanced HTTP details

For integrators who need the raw protocol surface. Most agents should use AXON above instead of calling these directly.

curl fallback

curl https://fact-checker-production-097f.up.railway.app/api/check \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: [signed_payment_envelope]" \
  -d '{"claim":"The Eiffel Tower is 330 meters tall","max_sources":5}'

Payment & settlement details

Raw on-chain settlement parameters. AXON above handles these automatically through quote / test-buy / governed fetch.

baseexact
$0.0050
per call
Pay-to address0x6e8b64638b24c6d625b045dd353120d850064e2e
T/O: 300s asset 0x8335…2913

Price & network

Cheapest call$0.0050
Networks
base

Trust & risk

Trust tier Indexed external
Pricing sanityCheap vs. categoryratio 0.25×
Risk flagsNo risks flagged
View JSON bundle

Indexed from facilitator discovery data

Last enriched:

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